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Computing (FOLDOC) dictionary
base 64
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file format, algorithm A file format using 64 ASCII
characters to encode the six bit binary data values 0-63.
To convert data to base 64, the first byte is placed in the
most significant eight bits of a 24-bit buffer, the next in
the middle eight, and the third in the least significant eight
bits. If there a fewer than three bytes to encode, the
corresponding buffer bits will be zero. The buffer is then
used, six bits at a time, most significant first, as indices
into the string
and the indicated character output. If there were only one or
two input bytes, the output is padded with two or one "="
characters respectively. This prevents extra bits being added
to the reconstructed data. The process then repeats on the
remaining input data.